According to the latest statement by Cardinal Angelo Amato, who is prefect for the Congregation for the Causes of the Saints, the dates will be announced on September 30th. It is on that date that Pope Francis will hold the Consistory of the Saints. This is a gathering of Cardinals, who along with the Pope, will set the date of Canonization for these two Popes.
Naturally that will put all speculation to rest. Certainly October is out, and based on what Pope Francis has said in the past it will probably be sometime in the spring when road conditions will be better for the thousands of Polish pilgrims who will undoubtedly want to attend.
One guess is Divine Mercy Sunday, which falls on April 27, 2014.